9
Underground Cables
CHAPTER OBJECTIVES
After reading this chapter, you should be able to:
- Understand the need for underground cables
- Provide constructional features and grading of cables
- Calculate the capacitance for three-core cables
- Provide the thermal characteristics and testing of cables
9.1 INTRODUCTION
Underground cables are used for power transmission and distribution in all such places where it is difficult to use an overhead system. In thickly populated areas such as cities and towns, the cables are laid below the ground surface. The combination of conductor and insulator over it is called a cable. Insulation is provided for the external protection of the cable against mechanical damage, moisture entry, and chemical reactions. ...
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